Respiratory system and circulatory system both are responsible to control the breathing in Human body.
<span>Ultra violet light is the catalyst that converts 7-dehydrocholesterol to provitamin D3. Ultra violet light can be obtained from the sun. The conversion happens when UVB light hits the skin (where 7-dehydrocholesterol naturally resides), gets absorbed, and us metabolized inside of the body.</span>
Answer: sunlight, water, air, habitat, and food.
Explanation: we are all living organisms and we all have our five basic necessities for survival; sunlight, water, air, habitat, and food.
Answer:
composting scraps
recycling is the action or process of converting waste into reusable material.
Here goes the question with no exact answer, lol <3
Scientists tell us that the observable universe is about 90 light years but then I wonder how they calculated that because the universe is immense!
I'm sorry but I can't go deeper into explaining as that's a tough question.
